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IEEJ Transactions on Electronics, Information and systems 2022年第3期142卷 264-272页

作者： Kawaguchi, Natsuki Higashide, Yuta Sato, Takao Takagi, Taro Mizumoto, Ikuro Graduate School of Engineering University of Hyogo 2167 Shosha Hyogo Himeji671-2280 Japan School of Engineering University of Hyogo 2167 Shosha Hyogo Himeji671-2280 Japan Department of Control Engineering National Institute of Technology Maizuru College 234 Shiroya Kyoto Maizuru625-8511 Japan Faculty of Advanced Science and Technology Kumamoto University 2-39-1 Kurokami Chuo-ku Kumamoto Kumamoto860-0862 Japan

A stable control system is easily designed with the simple adaptive control (SAC) method by using the almost strictly positive real (ASPR) condition of a plant. For the plant that does not satisfy ASPR, an SAC system can be designed by adding a parallel feed-forward compensator (PFC) to the plant. However, in this case, steady-state error between the plant output and the reference model output may remain because of the PFC output. To solve this problem, the null-space adjustor which cancels the PFC input on the steady-state of the system, has been proposed. In our study, an SAC system with the null-space adjustor was extended using a disturbance compensator. We showed the boundedness of the signal in the proposed SAC system and confirmed the effectiveness of the proposed method by the numerical simulation. © 2022 The Institute of Electrical Engineers of Japan.

关键词： Transient analysis

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Prediction of Therapy Response in Patients with NSCLC based on CT Images 2022

Prediction of Therapy Response in Patients with NSCLC based ...

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4th International Conference on Intelligent Medicine and Image Processing, IMIP 2022

作者： Zhang, Xianru Liu, Lixin Chen, W.E.I. Yang, Fengchang Qiao, X.U. Chen, Yen-Wei Department of Biomedical Engineering School of Control Science and Engineering Shandong University China School and Hospital of Stomatology Shandong University China Department of Radiology Shandong Cancer Hospital and Institute Cheeloo College of Medicine Shandong University China Graduate School of Information Science and Engineering Ritsumeikan University Japan

ISBN: (纸本)9781450396202

Lung cancer has the highest mortality rate, and patients with non-small cell lung cancer (NSCLC) account for 75% to 80% of these cases. Treatment response varies greatly among patients. Therefore, there is significant clinical value in predicting the therapy efficacy for patients. In this paper, we investigated the therapy efficacy prediction model based on CT images, including traditional radiomics methods and deep learning models in 2D and 3D. The model based on ResNet18 showed predictive performance and outperformed the conventional radiomics models in prediction. © 2022 ACM.

关键词： Forecasting

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Multiplier analysis of Lurye systems with power signals 63

Multiplier analysis of Lurye systems with power signals

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63rd IEEE Conference on Decision and control, CDC 2024

作者： Heath, William P. Carrasco, Joaquin Bangor University School of Computer Science and Engineering Dean St LL57 1UT United Kingdom Nancy Rothwell Building University of Manchester Control Systems and Robotics Group Department of Electrical and Electronic Engineering M13 9PL United Kingdom

ISBN: (纸本)9798350316339

Multipliers can be used to guarantee both the Lyapunov stability and input-output stability of Lurye systems with time-invariant memoryless slope-restricted nonlinearities. If a dynamic multiplier is used there is no guarantee the closedloop system has finite incremental gain. It has been suggested in the literature that without this guarantee such a system may be critically sensitive to time-varying exogenous signals including noise. We show that multipliers guarantee the power gain of the system to be bounded and quantifiable. Furthermore power may be measured about an appropriate steady state bias term, provided the multiplier does not require the nonlinearity to be odd. Hence dynamic multipliers can be used to guarantee Lurye systems have low sensitivity to noise, provided other exogenous systems have constant steady state. We illustrate the analysis with an example where the exogenous signal is a power signal with non-zero mean. © 2024 IEEE.

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Semantic Segmentation for Intersection Images with Domain Adaptation

Semantic Segmentation for Intersection Images with Domain Ad...

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IEEE Global Conference on Consumer Electronics (GCCE)

作者： Shota Suzuki Takafumi Katayama Tian Song Takashi Shimamoto Department of Science and Engineering Tokushima University Tokushima City Japan Computer Systems Engineering Institute of Technology and Science Graduate School of Engineering Tokushima University Tokushima City Japan

ISBN: (数字)9798350355079

ISBN: (纸本)9798350355086

Semantic segmentation enables high-accuracy object classification by assigning a class label to each pixel in an image. However, creating training data for segmentation is labor-intensive as it involves labeling every pixel. To alleviate the training cost, computer graphics (CG) datasets are considered as an efficient alternative solution. However, models trained on CG datasets may induce a significant drop in the intersection over union (IoU) when applied to real-world images due to domain differences. In this work, semi-supervised domain adaptation (SSDA) and unsupervised domain adaptation (UDA) training methods are adopted to achieve efficient segmentation models for intersection images. SSDA utilizes a small amount of labeled data from the target domain, while UDA does not use any labeled data from the target domain. Simulation results show that SSDA achieves similar accuracy to supervised learning across most classes, and UDA achieves comparable accuracy to supervised learning in certain classes.

关键词： Training Adaptation models Accuracy Semantic segmentation Simulation Roads Supervised learning Semantics Refining Training data

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Stabilization of Continuous-Time systems Against Stochastic Network Uncertainties:Fundamental Variance Bounds

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Journal of systems science & Complexity 2021年第5期34卷 1858-1878页

作者： QI Tian CHEN Jie School of Automation Science and Engineering Key Laboratory of Autonomous Systems and Networked ControlSouth China University of TechnologyGuangzhou 510640China Department of Electrical Engineering City University of Hong KongHong KongChina

This paper studies the stabilizability and stabilization of continuous-time systems in the presence of stochastic multiplicative *** authors consider multi-input,multi-output(MIMO)linear time-invariant systems subject to multiple static,structured stochastic uncertainties,and seek to derive fundamental conditions to ensure that a system can be stabilized under a mean-square *** the stochastic control framework,this problem can be considered as one of optimal control under state-or input-dependent random noises,while in the networked control setting,a problem of networked feedback stabilization over lossy communication *** authors adopt a mean-square small gain analysis approach,and obtain necessary and sufficient conditions for a system to be meansquare stabilizable via output *** single-input,single-output(SISO)systems,the condition provides an analytical bound,demonstrating explicitly how plant unstable poles,nonminimum phase zeros,and time delay may impose a limit on the uncertainty variance required for mean-square *** MIMO minimum phase systems with possible delays,the condition amounts to solving a generalized eigenvalue problem,readily solvable using linear matrix inequality optimization techniques.

关键词： Mean-square small gain theorem multiplicative stochastic uncertainty networked control

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Low Bit Rate Video Coding using VVC and DCVC-DC for River Surveillance

Low Bit Rate Video Coding using VVC and DCVC-DC for River Su...

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International Technical Conference o Circuits/systems, Computers and Communications (ITC-CSCC)

作者： Yuki Morimoto Takafumi Katayama Tian Song Takashi Shimamoto Department of Science and Engineering Tokushima University Tokushima City Japan Computer Systems Engineering Institute of Technology and Science Graduate School of Engineering Tokushima University Tokushima City Japan

ISBN: (数字)9798350379051

ISBN: (纸本)9798350379068

In this work, a video communication system to encode river video at a low bit rate is proposed. In the proposed system, a semantic segmantation is performed to organize the coding priority of each segment. Then, by setting an appropriate Quantization Parameter (QP) map for each region with VVenC which is the latest video codec of VVC, a low bitrate coding is achieved. We also compare the encoding performance with the latest Neural Video Codec (NVC), namely, DCVC-DC. The simulation results show that the proposed method with VVenC achieves ultra-low bit coding. Although the current version of DCVC-DC could not achieve ultra-low bit coding, the coding efficiency shows higher performance than that using VVenC in a wide range of bit rate.

关键词： Video coding Computers Quantization (signal) Surveillance Simulation Bit rate Semantics

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Intra Prediction Mode using Conditional-UNet by Stochastic Differential Equations for Next Generation Video Coding

Intra Prediction Mode using Conditional-UNet by Stochastic D...

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International Technical Conference o Circuits/systems, Computers and Communications (ITC-CSCC)

作者： Kohei Yamada Takafumi Katayama Tian Song Takashi Shimamoto Department of Science and Engineering Tokushima University Tokushima City Japan Computer Systems Engineering Institute of Technology and Science Graduate School of Engineering Tokushima University Tokushima City Japan

ISBN: (数字)9798350379051

ISBN: (纸本)9798350379068

With the spread of high-resolution video such as 8K and 360-degree videos, efficient video coding methods is still highly required. The intra prediction method of versatile video coding (VVC) achieves efficient coding by referencing neighboring pixel values based on predefined directional modes. However, it is difficult to further improve video coding efficiency using traditional linear models in the intra prediction mode. In this work, we propose a method to increase the coding efficiency by applying the image restoration technique. Specifically, image restoration technique uses Conditional-UNet combined with a stochastic differential equation (SDE) to generate highly accurate predicted pixels. The simulation results show that the proposed algorithm can achieve an improvement of 29.14 % on BD-rate compared to the original VVC algorithm at random access. Moreover, the proposed algorithm reduces the training and inference time through optimized parameters.

关键词： Video coding Training Image coding Accuracy Stochastic processes Differential equations Maintenance engineering

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Bitrate control for VVC based on RD-Cost Estimation with YOLOv8

Bitrate Control for VVC based on RD-Cost Estimation with YOL...

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IEEE Global Conference on Consumer Electronics (GCCE)

作者： Kaito Goto Takafumi Katayama Tian Song Takashi Shimamoto Department of Science and Engineering Tokushima University Tokushima City Japan Computer Systems Engineering Institute of Technology and Science Graduate School of Engineering Tokushima University Tokushima City Japan

ISBN: (数字)9798350355079

ISBN: (纸本)9798350355086

In recent applications, a modern object recognition model is available together with the video encoder. In this work, an adaptive bitrate control algorithm is proposed using a You Only Look Once v8 (YOLOv8) model for Versatile Video Coding (VVC). YOLOv8 object detection network, which is also suitable for real-time processing, is used as an algorithm to detect salient regions before encoding. The proposed algorithm estimates Rate-Distortion Cost (RD-Cost) of Coding Tree Units (CTUs) with YOLOv8 and selects the Quantization Parameter (QP) based on the object detection result. Simulation results show that the proposed algorithm achieves a maximum bitrate reduction rate of 7.76% and improves coding efficiency while minimizing image quality degradation.

关键词： Image quality Degradation YOLO Video coding Adaptation models Image coding Bit rate Estimation Encoding Vectors

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Efficient Deraining Model Using Transformer and Kernel Basis Attention for UAVs

Efficient Deraining Model Using Transformer and Kernel Basis...

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International Technical Conference o Circuits/systems, Computers and Communications (ITC-CSCC)

作者： Yuto Tomida Takafumi Katayama Tian Song Takashi Shimamoto Department of Science and Engineering Tokushima University Tokushima City Japan Computer Systems Engineering Institute of Technology and Science Graduate School of Engineering Tokushima University Tokushima City Japan

ISBN: (数字)9798350379051

ISBN: (纸本)9798350379068

Unmanned aerial vehicles (UAVs) have remarkably advanced and expected to be useful in a variety of fields. However, there is a serious problem of video quality degradation due to rainy weather, regardless of whether the UAVs are flying autonomously. In this work, we propose a highly accurate method to remove the effect of rain streaks from images captured by UAVs in rainy conditions. This approach uses the multi-axis feature fusion (MFF) block including the kernel basis attention (KBA) module. The proposed method shows better performance than the previous deraining methods in PSNR and SSIM. Moreover, the proposed method is effective for varying rain streak intensity.

关键词： Rain Computational modeling Autonomous aerial vehicles Transformers Real-time systems Quality assessment Kernel

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General Kinematics and Simulation for Mobile Robot Adapted Three Unconstraint Rollers 4

General Kinematics and Simulation for Mobile Robot Adapted T...

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4th IEEE International Conference on Electrical, Computer, and Energy Technologies, ICECET 2024

作者： Kimura, Kenji Ishii, Kazuo National Institute of Technology Matsue College Department of Control Engineering 14-4 Nishi-ikuma-cho Matsue Matsue Shimane690-8518 Japan Graduate School of Life Science and engineering Kyushu Institute of Technology 2-4 Hibikino Wakamatsu-ku Kitakyushu-shi Fukuoka808-0196 Japan

ISBN: (纸本)9798350395914

In recent years, efficient mobility is required for omni-directional mobile robots in the logistics industry. There are various types of rollers mounted on mobile robots. Among them, omni-directional rollers (omni roller) are considered to have excellent omni-directional mobility and easy control. Assuming a circular mechanism, kinematics has been derived assuming an arbitrary arrangement along this circumference, and several studies have evaluated roller arrangements in terms of the speed efficiency of the driving rollers. To evaluate the roller arrangement, kinematics is necessary, in which not only the contact position of the rollers but also the direction is a parameter. In this study, kinematics is derived for a mobile robot equipped with three omni-rollers, with the contact position and direction of the rollers as parameters, and the behaviors of the roller velocity is investigated for the robot's movement in all directions. © 2024 IEEE.

关键词： Mobile robots

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